1. Catriona gymnota. Specimen with olive digestive gland and powdery orange and white distally on cerata. Length 10 mm. Near Tubularia on reef exposed to strong tidal rip, LWS, Orkney, Scotland. August 1976.
2. Catriona gymnota. Specimen with olive digestive gland and powdery orange and white distally on cerata. Length 10 mm. Near Tubularia on reef exposed to strong tidal rip, LWS, Orkney, Scotland. August 1976.

Catriona gymnota. Specimen with olive digestive gland and powdery orange and white distally on cerata. Length 10 mm. Near Tubularia on reef exposed to strong tidal rip, LWS, Orkney, Scotland. August 1976.